Remove USE(3D_GRAPHICS) as it is always turned on.

Source/core/platform/graphics/GraphicsContext3D.cpp

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2010 Mozilla Corporation. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
  */
 
 #include "config.h"
 
-#if USE(3D_GRAPHICS)
-
 #include "core/platform/graphics/GraphicsContext3D.h"
 #include "core/platform/graphics/cpu/arm/GraphicsContext3DNEON.h"
 
 #include "ImageData.h"
 #include "SkTypes.h"
 #include "core/html/canvas/CheckedInt.h"
 #include "core/platform/chromium/support/GraphicsContext3DPrivate.h"
 #include "core/platform/graphics/Extensions3D.h"
 #include "core/platform/graphics/Image.h"
 #include "core/platform/graphics/ImageBuffer.h"
@@ skipping 2297 matching lines @@
     case GraphicsContext3D::STENCIL_INDEX8:
         return ChannelStencil;
     case GraphicsContext3D::DEPTH_STENCIL:
         return ChannelDepth | ChannelStencil;
     default:
         return 0;
     }
 }
 
 } // namespace WebCore
-
-#endif // USE(3D_GRAPHICS)